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Method for preparing barium sulfate nanoparticles

A nanoparticle, barium sulfate technology, applied in nanotechnology, calcium/strontium/barium sulfate and other directions, can solve the problems of small nucleation, uneven nucleation, affecting particle quality, etc., and achieves good repeatability and stability. , The operation process is simple and the cost of raw materials is low.

Active Publication Date: 2011-08-31
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods either introduce other reaction components, which increases the difficulty of subsequent separation; or the particle size of the prepared particles is too large, the distribution is wide, and the monodispersity is not good, such as the Glauber's salt-black ash method, the existing particle size of the process product is very large Difficult to reach the nanoscale
The reason for this situation is that the microscopic mixing of materials is poor, the transfer process is slow, and the nucleation amount is small and uneven during direct precipitation, which directly affects the quality of the particles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] At 70°C, prepare 1000 mL of a barium sulfide suspension with a molar concentration of 2.5 mol / L and 800 g of a 45% sodium sulfate solution. Under the action of pressure difference, the sodium sulfate solution passes through micropores with an equivalent diameter of 200 microns at a flow rate of 0.5m / s and mixes with the barium sulfide suspension flowing in a cross-flow cycle with a flow rate of 1m / s to generate sulfuric acid. Barium is precipitated, and the reaction is cycled to the stoichiometric ratio. The product is matured, separated from solid and liquid, washed with water to remove impurities, dried and pulverized to obtain final barium sulfate particles with an average particle diameter of 48nm.

Embodiment 2

[0022] At 50°C, prepare 1000 mL of barium sulfide solution with a molar concentration of 1.5 mol / L and 720 g of a 30% sodium sulfate solution. Under the action of pressure difference, the sodium sulfate solution passes through the micropores with an equivalent diameter of 200 microns at a flow rate of 5 m / s and mixes with the barium sulfide solution that flows in a cross flow with a flow rate of 3 m / s, and reacts to form barium sulfate precipitates. The product is matured, separated from solid and liquid, washed with water to remove impurities, dried and pulverized to obtain final barium sulfate particles with an average particle diameter of 43nm.

Embodiment 3

[0024] At 20°C, prepare 1000 mL of a barium sulfide suspension with a molar concentration of 0.5 mol / L and 720 g of a 10% sodium sulfate solution. Under the action of pressure difference, the sodium sulfate solution passes through micropores with an equivalent diameter of 600 microns at a flow rate of 0.1 m / s and mixes with barium sulfide suspension with a flow rate of 0.3 m / s for cross-flow circulation, and the reaction forms Barium sulfate is precipitated, and the reaction is cycled to the stoichiometric ratio. The product is matured, separated from solid and liquid, washed with water to remove impurities, dried and pulverized to obtain final barium sulfate particles with an average particle diameter of 40nm.

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PUM

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Abstract

The invention discloses a method for preparing barium sulfate nanoparticles, belonging to the technical field of preparation of chemical materials. The method comprises the following steps: vertically dispersing a sodium sulfate solution into a flowing barium sulphide solution or circularly following barium sulphide suspension liquid through a plurality of micropores, cutting the sodium sulfate solution by means of cross flow, reacting in a mixing way to obtain a barium sulfate precipitate, and carrying out curing, solid-liquid separation, impurity removal in a washing way, drying and smashing on reaction product to obtain the barium sulfate nanoparticles. The method for preparing the barium sulfate nanoparticles is low in raw material cost, high in production capacity, simple and convenient in operation process, and good in repeatability and stability, so that the conventional mirabilite-black ash method can enter into the production sequence of the nanometer level barium sulfate nanoparticles. The method can be used for preparing the barium sulfate nanoparticles with the mean grain sizes of 35-48nm.

Description

technical field [0001] The invention belongs to the technical field of chemical material preparation, and in particular relates to a method for preparing barium sulfate nanoparticles, in particular to a method for preparing barium sulfate nanoparticles by a micropore dispersion method utilizing liquid phase cross-flow shearing. Background technique [0002] Barium sulfate nanoparticles have small size effect and good chemical stability, and are widely used in coatings, plastics, filling materials and additives for paints and other fields. The preparation method of barium sulfate nanoparticle commonly used at present mainly contains: (1) Glauber's salt-black ash method-with sodium sulfide, barium brine and sodium sulfate as raw material, at first obtain barium sulfide solution or slurry, mix with sodium sulfate solution afterwards, produce Chemical reaction, then adjust the pH value to the end of the reaction to obtain barium sulfate slurry, and finally obtain the product; (2...

Claims

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Application Information

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IPC IPC(8): C01F11/46B82Y40/00
Inventor 骆广生杜乐吕阳成王玉军
Owner TSINGHUA UNIV
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